I just installed K2 v2.6.0 on a clean new Joomla 2.5.7
When i create a category i see the follow error:

Strict Standards: Declaration of JParameter::loadSetupFile() should be compatible with JRegistry::loadSetupFile() in D:\xampp\htdocs\Joomla3\Joomla_2.5.7\libraries\joomla\html\parameter.php on line 512

Notice: Undefined property: K2ViewItemlist::$items in D:\xampp\htdocs\Joomla3\Joomla_2.5.7\components\com_k2\views\itemlist\view.html.php on line 628

When i change the error settings of the server to "none" in Joomla this messages are gone.

Also i don't see the quick K2 icons in the administrator panel. How can i see them again ?

Hi

I receive the following error, does anyone know what could be the problem?

Model class cpanelModelCpanel not found in file

I have the same problem after the upgrade from 2.5.7 to 2.6.0

Fatal error: Call to a member function categoriesTree() on a non-object in /home/public_html/administrator/components/com_k2/views/items/view.html.php on line 124

Yes indeed.
"Model class cpanelModelCpanel not found in file" after the update from 2.5.6 to 2.5.7 version.

Any solution?
But not hide the error msg. This is not a solution!

Thanks a lot

same error here!!!

what should we do? go back to previous version until this is solved?

After upgrade I get message also:

Model class cpanelModelCpanel not found in file

!!!

I re-installed previous version and error went away funny thing is Joomla! now says am totally up to date which am not!

Just used the update function within the Joomla CP to upgrade from a fresh install of Joomla and got the same error message.

Thoughts on what is causing the error in the first place?

Model class cpanelModelCpanel not found in file

Question = Not found in What file?

You are right. After re-installation of previous k2 version v2.5.7 the error is gone.

Same problem. Any solution to not reinstall the previous version?

Also fails MINI-K2 Content module can not find the items, the message:
"Please check your setting to get the items or maybe you need to write your K2 items first."